@article{ZNSL_1981_112_a13,
     author = {S. I. Fedorov},
     title = {Maximum of a~conformal invariant in the problem of nonoverlapping domains},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--183},
     year = {1981},
     volume = {112},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1981_112_a13/}
}